Some words for you

• aerial - Of, pertaining to, or like the air.
• aeronaut - One who navigates the air, a balloonist.
• aeronautics - the art or practice of flying aircraft
• aerostat - A balloon or other apparatus floating in or sustained by the air.
• aerostatics - The branch of pneumatics that treats of the equilibrium, pressure, and mechanical properties.
• advocacy - The act of pleading a cause
• advisory - Not mandatory
• advert - To refer incidentally